The molecule directly responsible for breaking down cAMP to inactive AMP is
A. phosphodiesterase.
B. protein kinase A.
C. protein phosphatase.
D. adenylyl cyclase.
E. GTPase.
Answer: A
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Which of the following research questions would a population geneticist be likely to ask?
A. How much genetic variability is found in sperm whales? B. How can we explain the amount of genetic diversity in Adelie penguins? C. Why do some species have more genetic diversity than others? D. All of the above are questions a population geneticist may ask.
A riboswitch mechanism is known to regulate the transcription of genes involved in:
A. lactose metabolism. B. vitamin B1 synthesis. C. tryptophan biosynthesis. D. arabinose metabolism.
The human immunodeficiency virus mounts a direct attack on TH cells by recognizing the _______ surface proteins associated with these cells.
A. Fc B. CD4 C. epitope D. cytokine
A student sitting in the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists. One by one (beginning from the back of the room) the students began to cough due to the foul smell. This phenomena was due to
A. an allergic reaction. B. osmosis. C. molecules moving from an area of low concentration to high concentration. D. diffusion. E. active transport.